diff --git a/cmd/db_schema_declarative.go b/cmd/db_schema_declarative.go
index 8cb98b991..896b7bd58 100644
--- a/cmd/db_schema_declarative.go
+++ b/cmd/db_schema_declarative.go
@@ -52,7 +52,12 @@ var (
 			// If the user has passed the --experimental flag and pg-delta is not enabled, enable it
 			// so in the rest of the code we can know that we're running pg-delta logic.
 			if viper.GetBool("EXPERIMENTAL") && !utils.IsPgDeltaEnabled() {
-				utils.Config.Experimental.PgDelta = &config.PgDeltaConfig{Enabled: true}
+				if utils.Config.Experimental.PgDelta == nil {
+					utils.Config.Experimental.PgDelta = &config.PgDeltaConfig{Enabled: true}
+				} else {
+					// We preserve the version set into `.temp/pgdelta-version` by just enabling pg-delta.
+					utils.Config.Experimental.PgDelta.Enabled = true
+				}
 			}
 			if !utils.IsPgDeltaEnabled() {
 				utils.CmdSuggestion = fmt.Sprintf("Either pass %s or add %s with %s to %s",
diff --git a/internal/db/diff/pgdelta.go b/internal/db/diff/pgdelta.go
index 8ba8fb0fe..dd6af8492 100644
--- a/internal/db/diff/pgdelta.go
+++ b/internal/db/diff/pgdelta.go
@@ -14,6 +14,7 @@ import (
 	"github.com/jackc/pgx/v4"
 	"github.com/supabase/cli/internal/gen/types"
 	"github.com/supabase/cli/internal/utils"
+	"github.com/supabase/cli/pkg/config"
 )
 
 //go:embed templates/pgdelta.ts
@@ -104,7 +105,8 @@ func DiffPgDeltaRef(ctx context.Context, sourceRef, targetRef string, schema []s
 		binds = append(binds, cwd+":/workspace")
 	}
 	var stdout, stderr bytes.Buffer
-	if err := utils.RunEdgeRuntimeScript(ctx, env, pgDeltaScript, binds, "error diffing schema", &stdout, &stderr); err != nil {
+	script := config.InterpolatePgDeltaScript(config.Config(&utils.Config), pgDeltaScript)
+	if err := utils.RunEdgeRuntimeScript(ctx, env, script, binds, "error diffing schema", &stdout, &stderr); err != nil {
 		return "", err
 	}
 	return stdout.String(), nil
@@ -143,7 +145,8 @@ func DeclarativeExportPgDeltaRef(ctx context.Context, sourceRef, targetRef strin
 		binds = append(binds, cwd+":/workspace")
 	}
 	var stdout, stderr bytes.Buffer
-	if err := utils.RunEdgeRuntimeScript(ctx, env, pgDeltaDeclarativeExportScript, binds, "error exporting declarative schema", &stdout, &stderr); err != nil {
+	script := config.InterpolatePgDeltaScript(config.Config(&utils.Config), pgDeltaDeclarativeExportScript)
+	if err := utils.RunEdgeRuntimeScript(ctx, env, script, binds, "error exporting declarative schema", &stdout, &stderr); err != nil {
 		return DeclarativeOutput{}, err
 	}
 	if stdout.Len() == 0 {
@@ -179,7 +182,8 @@ func ExportCatalogPgDelta(ctx context.Context, targetRef, role string, options .
 		binds = append(binds, cwd+":/workspace")
 	}
 	var stdout, stderr bytes.Buffer
-	if err := utils.RunEdgeRuntimeScript(ctx, env, pgDeltaCatalogExportScript, binds, "error exporting pg-delta catalog", &stdout, &stderr); err != nil {
+	script := config.InterpolatePgDeltaScript(config.Config(&utils.Config), pgDeltaCatalogExportScript)
+	if err := utils.RunEdgeRuntimeScript(ctx, env, script, binds, "error exporting pg-delta catalog", &stdout, &stderr); err != nil {
 		return "", err
 	}
 	snapshot := strings.TrimSpace(stdout.String())
diff --git a/internal/db/pgcache/cache.go b/internal/db/pgcache/cache.go
index c6881c84c..aeb1ebfbc 100644
--- a/internal/db/pgcache/cache.go
+++ b/internal/db/pgcache/cache.go
@@ -20,6 +20,7 @@ import (
 	"github.com/spf13/viper"
 	"github.com/supabase/cli/internal/gen/types"
 	"github.com/supabase/cli/internal/utils"
+	"github.com/supabase/cli/pkg/config"
 	"github.com/supabase/cli/pkg/migration"
 )
 
@@ -253,7 +254,8 @@ func exportCatalog(ctx context.Context, targetRef string, options ...func(*pgx.C
 	}
 	binds := []string{utils.EdgeRuntimeId + ":/root/.cache/deno:rw"}
 	var stdout, stderr bytes.Buffer
-	if err := utils.RunEdgeRuntimeScript(ctx, env, pgDeltaCatalogExportTS, binds, "error exporting pg-delta catalog", &stdout, &stderr); err != nil {
+	script := config.InterpolatePgDeltaScript(config.Config(&utils.Config), pgDeltaCatalogExportTS)
+	if err := utils.RunEdgeRuntimeScript(ctx, env, script, binds, "error exporting pg-delta catalog", &stdout, &stderr); err != nil {
 		return "", err
 	}
 	snapshot := strings.TrimSpace(stdout.String())
diff --git a/internal/pgdelta/apply.go b/internal/pgdelta/apply.go
index 2c57eb506..f9009a320 100644
--- a/internal/pgdelta/apply.go
+++ b/internal/pgdelta/apply.go
@@ -15,6 +15,7 @@ import (
 	"github.com/spf13/afero"
 	"github.com/spf13/viper"
 	"github.com/supabase/cli/internal/utils"
+	pkgconfig "github.com/supabase/cli/pkg/config"
 )
 
 //go:embed templates/pgdelta_declarative_apply.ts
@@ -321,7 +322,8 @@ func ApplyDeclarative(ctx context.Context, config pgconn.Config, fsys afero.Fs)
 
 	fmt.Fprintln(os.Stderr, "Applying declarative schemas via pg-delta...")
 	var stdout, stderr bytes.Buffer
-	if err := utils.RunEdgeRuntimeScript(ctx, env, pgDeltaDeclarativeApplyScript, binds, "error running pg-delta script", &stdout, &stderr); err != nil {
+	script := pkgconfig.InterpolatePgDeltaScript(pkgconfig.Config(&utils.Config), pgDeltaDeclarativeApplyScript)
+	if err := utils.RunEdgeRuntimeScript(ctx, env, script, binds, "error running pg-delta script", &stdout, &stderr); err != nil {
 		return err
 	}
 
diff --git a/internal/utils/misc.go b/internal/utils/misc.go
index 9a1c420fc..7ba482d96 100644
--- a/internal/utils/misc.go
+++ b/internal/utils/misc.go
@@ -86,6 +86,7 @@ var (
 	PgmetaVersionPath    = filepath.Join(TempDir, "pgmeta-version")
 	PoolerVersionPath    = filepath.Join(TempDir, "pooler-version")
 	RealtimeVersionPath  = filepath.Join(TempDir, "realtime-version")
+	PgDeltaVersionPath   = filepath.Join(TempDir, "pgdelta-version")
 	CliVersionPath       = filepath.Join(TempDir, "cli-latest")
 	CurrBranchPath       = filepath.Join(SupabaseDirPath, ".branches", "_current_branch")
 	// DeclarativeDir is the canonical location for pg-delta declarative schema
diff --git a/pkg/config/config.go b/pkg/config/config.go
index 8e5a4b943..e2697ad82 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -229,6 +229,8 @@ type (
 		Enabled               bool   `toml:"enabled" json:"enabled"`
 		DeclarativeSchemaPath string `toml:"declarative_schema_path" json:"declarative_schema_path"`
 		FormatOptions         string `toml:"format_options" json:"format_options"`
+		// NpmVersion is set from .temp/pgdelta-version during Load (not from TOML).
+		NpmVersion string `toml:"-" json:"-"`
 	}
 
 	inspect struct {
@@ -690,6 +692,16 @@ func (c *config) Load(path string, fsys fs.FS, overrides ...ConfigEditor) error
 	if version, err := fs.ReadFile(fsys, builder.LogflareVersionPath); err == nil && len(version) > 0 {
 		c.Analytics.Image = replaceImageTag(Images.Logflare, string(version))
 	}
+	v := DefaultPgDeltaNpmVersion
+	if version, err := fs.ReadFile(fsys, builder.PgDeltaVersionPath); err == nil {
+		if trimmed := strings.TrimSpace(string(version)); len(trimmed) > 0 {
+			v = trimmed
+		}
+	}
+	if c.Experimental.PgDelta == nil {
+		c.Experimental.PgDelta = &PgDeltaConfig{}
+	}
+	c.Experimental.PgDelta.NpmVersion = v
 	// TODO: replace derived config resolution with viper decode hooks
 	if err := c.resolve(builder, fsys); err != nil {
 		return err
diff --git a/pkg/config/config_test.go b/pkg/config/config_test.go
index abd581d11..d7bca3948 100644
--- a/pkg/config/config_test.go
+++ b/pkg/config/config_test.go
@@ -243,6 +243,57 @@ format_options = "not-json"
 	})
 }
 
+func TestPgDeltaNpmVersionPinning(t *testing.T) {
+	t.Run("defaults when pgdelta-version file missing", func(t *testing.T) {
+		c := NewConfig()
+		require.NoError(t, c.Load("", fs.MapFS{}))
+		require.NotNil(t, c.Experimental.PgDelta)
+		assert.Equal(t, DefaultPgDeltaNpmVersion, c.Experimental.PgDelta.NpmVersion)
+		assert.Equal(t, DefaultPgDeltaNpmVersion, EffectivePgDeltaNpmVersion(Config(&c)))
+	})
+
+	t.Run("EffectivePgDeltaNpmVersion nil config uses default", func(t *testing.T) {
+		assert.Equal(t, DefaultPgDeltaNpmVersion, EffectivePgDeltaNpmVersion(nil))
+	})
+
+	t.Run("reads trimmed version from supabase/.temp/pgdelta-version", func(t *testing.T) {
+		c := NewConfig()
+		fsys := fs.MapFS{
+			"supabase/config.toml": &fs.MapFile{Data: []byte(`
+[experimental.pgdelta]
+enabled = true
+`)},
+			"supabase/.temp/pgdelta-version": &fs.MapFile{Data: []byte("  9.9.9-test  \n")},
+		}
+		require.NoError(t, c.Load("", fsys))
+		require.NotNil(t, c.Experimental.PgDelta)
+		assert.Equal(t, "9.9.9-test", c.Experimental.PgDelta.NpmVersion)
+		assert.Equal(t, "9.9.9-test", EffectivePgDeltaNpmVersion(Config(&c)))
+	})
+
+	t.Run("whitespace-only pgdelta-version keeps default", func(t *testing.T) {
+		c := NewConfig()
+		fsys := fs.MapFS{
+			"supabase/config.toml": &fs.MapFile{Data: []byte(`
+[experimental.pgdelta]
+enabled = true
+`)},
+			"supabase/.temp/pgdelta-version": &fs.MapFile{Data: []byte("   \n")},
+		}
+		require.NoError(t, c.Load("", fsys))
+		require.NotNil(t, c.Experimental.PgDelta)
+		assert.Equal(t, DefaultPgDeltaNpmVersion, c.Experimental.PgDelta.NpmVersion)
+	})
+
+	t.Run("InterpolatePgDeltaScript substitutes placeholder", func(t *testing.T) {
+		c := NewConfig()
+		require.NoError(t, c.Load("", fs.MapFS{}))
+		// Embedded TS pins use this semver literal before InterpolatePgDeltaScript runs.
+		got := InterpolatePgDeltaScript(Config(&c), `from "npm:@supabase/pg-delta@1.0.0-alpha.20";`)
+		assert.Equal(t, `from "npm:@supabase/pg-delta@`+DefaultPgDeltaNpmVersion+`";`, got)
+	})
+}
+
 func TestRemoteOverride(t *testing.T) {
 	t.Run("load staging override", func(t *testing.T) {
 		config := NewConfig()
diff --git a/pkg/config/pgdelta_version.go b/pkg/config/pgdelta_version.go
new file mode 100644
index 000000000..297a4c34b
--- /dev/null
+++ b/pkg/config/pgdelta_version.go
@@ -0,0 +1,28 @@
+package config
+
+import "strings"
+
+// DefaultPgDeltaNpmVersion is the npm dist-tag/version used for @supabase/pg-delta
+// when supabase/.temp/pgdelta-version is absent or empty.
+const DefaultPgDeltaNpmVersion = "1.0.0-alpha.22"
+
+const pgDeltaNpmVersionPlaceholder = "1.0.0-alpha.20"
+
+// EffectivePgDeltaNpmVersion returns the pg-delta npm version from loaded config,
+// or DefaultPgDeltaNpmVersion when unset (e.g. before Load or empty field).
+func EffectivePgDeltaNpmVersion(c Config) string {
+	if c == nil {
+		return DefaultPgDeltaNpmVersion
+	}
+	if c.Experimental.PgDelta != nil {
+		if v := strings.TrimSpace(c.Experimental.PgDelta.NpmVersion); v != "" {
+			return v
+		}
+	}
+	return DefaultPgDeltaNpmVersion
+}
+
+// InterpolatePgDeltaScript substitutes pg delta npm version placeholders in embedded TS.
+func InterpolatePgDeltaScript(c Config, script string) string {
+	return strings.ReplaceAll(script, pgDeltaNpmVersionPlaceholder, EffectivePgDeltaNpmVersion(c))
+}
diff --git a/pkg/config/utils.go b/pkg/config/utils.go
index 2bb6db6f4..4c004d4ee 100644
--- a/pkg/config/utils.go
+++ b/pkg/config/utils.go
@@ -28,6 +28,7 @@ type pathBuilder struct {
 	RealtimeVersionPath    string
 	EdgeRuntimeVersionPath string
 	LogflareVersionPath    string
+	PgDeltaVersionPath     string
 	CliVersionPath         string
 	CurrBranchPath         string
 	SchemasDir             string
@@ -64,6 +65,7 @@ func NewPathBuilder(configPath string) pathBuilder {
 		PoolerVersionPath:      filepath.Join(base, ".temp", "pooler-version"),
 		RealtimeVersionPath:    filepath.Join(base, ".temp", "realtime-version"),
 		LogflareVersionPath:    filepath.Join(base, ".temp", "logflare-version"),
+		PgDeltaVersionPath:     filepath.Join(base, ".temp", "pgdelta-version"),
 		CliVersionPath:         filepath.Join(base, ".temp", "cli-latest"),
 		CurrBranchPath:         filepath.Join(base, ".branches", "_current_branch"),
 		SchemasDir:             filepath.Join(base, "schemas"),